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twin turbo setup on ls1?

Discussion in 'LSx Development and Modification' started by cpbait, Mar 26, 2010.

  1. cpbait

    cpbait New Member

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    been looking around the parts for sale areas and ebay and found some superchargers and more so turbo's, just curious and wondering what size turbo's would i need for a twin turbo set up to see any power gains?

    i'v basically worked out the size cam i want which is for FI and will do head work at same time with bottom end down the track or same time depending.

    iv seen a couple of t3-t4 turbo's on here and ebay with internal waistgates for around the $500-$900 mark, etc and they say there good for under 3 ltr but good for quick punchy power as a twin set up on 5ltr-6/6.2ltr engines, just curious to what size/s would be good with out having massive turbo's atm.

    also seen some slightly larger turbos that require external waistgates.

    i know this opens a whole can of worms to how much power, etc, but more want as an extra bit of induction atm and more on a budget so to speak as can do most of the install work myself, but don't have budget for a GENTT kit on top of cam install. Also this way so i can just upgrade turbos later.

    cheers, Ben.
     
  2. acarmody

    acarmody Donati..Whoa Green

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    Screw cam, get GENTT kit!

    Unless your good with welding and can make your own piping, I don't think your going to beat the price that GENTT can supply all the parts for.
     
  3. GenReaper

    GenReaper Donating Member

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  4. cpbait

    cpbait New Member

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    cheers GenReaper, yeh i know a few guys i work with on the tools that have put turbo kits on there v6 commodore's for around the $2,000-$3,000 all up including turbo they got of ebay and exhaust manifold done and cooler, that is minus tune, with no problems. so willing to give it a shot for the extra price of a turbo on the other side and have to do headers any way no matter which way i go, so can play around with the headers a bit.
     
  5. Vt_vic

    Vt_vic New Member

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    the gen t kit was 4999 dunno bout the twin though its gonna be around the 10 mark
     
  6. SirNemesis

    SirNemesis New Member

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    If you have any kind of satisfaction in build quality, don't touch the GEN-TT kit. If you want to build your own kit for a stockish LS1, I'd suggest a pair of GT28 turbos. Don't exclude a decent single turbo kit too quickly though, they can be done much cheaper and the difference in spool speed isn't significant as you'd think. It is a V8 engine afterall, and you'll still have plenty of compression, so even off-boost it isn't going to be a dog.

    Check out the single turbo kits from both ASE and GenRacing.
     
  7. cpbait

    cpbait New Member

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    sweet thanks for that, yeh the turbo's i was looking at are just a bit bigger than t28's, a couple of other people have said the GTR skyline twin turbo kits are good as people only replace them for a single.
     
  8. GMMAD

    GMMAD New Member

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    if you want to build it look at the vg30 turbo they are the biggest of the T3
    or you can use the T28 but it needs to be the T2890 not the smaller nissan type
    as said dont touch the gentt kit
     
  9. cpbait

    cpbait New Member

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    yeh i was looking at possibly 2x kkr 430 turbo's internally waistgated, not sure if there a t3 or what and not sure how much psi they can be run at, etc. found them on an ebay store as well for around the $500-550 mark each, says there good for 1.8-3.5 ltr engines as a single and 5ltr-6.2/3 ltrs as a twin turbo setup.

    i think it said there a t4 flange on them so weather there a t4 or a bigger t3 i'm not sure.
     
  10. GMMAD

    GMMAD New Member

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    kkr are the same turbos used in the gentt kits
    they where having troubles with seals leaking with them I would use the Nissan t3's they are garrett so you know they are good
     
  11. cpbait

    cpbait New Member

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    oh ok, maybe that's why iv seen a few new ones come up for sale with people buying other turbo's, yeh garret are a good brand, iv worked on turbo cars before but diesels with garret turbo's and no problems except for obvious age wear when they've done nearly 300,000 km's+. thanks for that, glad i asked around other wise i would've purchased 2 of the ones i saw, appreciate it.
     
  12. SirNemesis

    SirNemesis New Member

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  13. cpbait

    cpbait New Member

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    does this sound like a good turbo to use if i had 2 of them? or a little small for a ls1 with a cam and head work?


    T3 Flange great for SKYLINE, COMMODORE RB20 RB25 RB30 RB26

    also great for HIGH POWER SILVIA ++

    550HP TURBO with EXT wastegate setup



    T3 T4 T04E TURBOCHARGER

    SPEC

    .50 A/R compressor .63 A/R Turbine .57 Trim

    Turbin Wheel - Exducer : 2.48" Mayor " 2.89"

    Compressor Wheel - Exducer 2.07" Mayor : 2.36"
     
  14. benjamino

    benjamino needing some more undies

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    yeah mate ive heard bad things about kkr turbos,
    im going through this process atm mate, have got myself a garrett t04z single, and am fitting up over the easter long weekend.
    i drove the single turbo and twin turbo and i can honestly say if you wanted to do it on a budget, the single spool difference is negligible, the power output almost identical, and the labour cost difference of single outweigh the benefits of twins.
    ill let u know how she goes:)
     
  15. cpbait

    cpbait New Member

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    cheers mate, yeh sounds about right, i know a lot of the rice drivers swap the twin turbos for single turbo setups on gtr's, supras, soarers, etc, getting a lot of good info atm which has been very helpfull.
     
  16. Vt_vic

    Vt_vic New Member

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    what is wrong with the gent kits does seem quite cheap maybe its for a reason?
     
  17. cpbait

    cpbait New Member

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    the turbos that they use as mentioned in the above posts.
     
  18. SirNemesis

    SirNemesis New Member

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    The turbos are rubbish (the GTDW ones are better though), but that isn't my main concern. The pipe work doesn't fit, regardless of what Martin tells you, or what it says on the website. It takes SIGNIFICANT grinding and modification to get the kit to even closely fit, and even then you'll be so dissatisfied you'll wish you never bothered. Trust me, I've been through it.
     
  19. benjamino

    benjamino needing some more undies

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    Ahhh the frustration. i could imagine.
    Im sure ill go through my fair share of it this wknd when im fitting mine up :p
     
  20. OFF T4P

    OFF T4P Donating Member

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